The column mounted vacuum circuit breaker is a new type of indoor AC metal enclosed switchgear, which adopts a fully sealed and oil-free design, and has the characteristics of small volume, light weight, and easy installation. This product is widely used in the power transformation and distribution systems of residential communities, high-rise buildings, and factories.
一、 Structural features:
1. The shell frame is of steel structure;
2. The insulation parts are poured and formed with epoxy resin;
3. The contact material shall be made of high wear resistant materials such as silver tungsten alloy or silver nickel cobalt alloy.
二 Main technical parameters:
1. Rated voltage:380vac50hz.
2. Rated capacity:6kva-10kva.
3. Breaking current:10ka to 20ka.
4. Dynamic thermal stability:≤ ± 2%.
5. Short circuit breaking capacity:1 second.
6. Temperature rise:5 ° C.
7. Environmental temperature:-55 ° C~60 ° C.
8. Relative humidity:20% -85%.
三、 The scope of application is mainly used for connecting and disconnecting loads in residential electricity and industrial power distribution lines.
四、 Working principle: When the power input terminal is introduced into the column vacuum circuit breaker through a cable, the high-voltage arc forms a high-temperature gas space inside the arc extinguishing cover. When the contact is closed, an arc is generated, ionizing the air into positively charged ion and electron currents. At the same time, the surrounding oxygen is ionized into negative ions and adsorbed on the contact to form a plasma (commonly known as "fire"), which quickly extinguishes the arc and achieves the goal of quickly breaking faults.
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